Enable ai_gateway_docs_search as beta feature
What does this MR do and why?
Enable ai_gateway_docs_search as beta feature, mainly for self-managed instances.
Gitlab.com won't be affected since currently it has this disabled explicitly.
Also force doc tool to use claude 2.1 to avoid issues.
MR acceptance checklist
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Screenshots or screen recordings
How to set up and validate locally
- Obtain the latest AI Gateway with vertex AI set up properly
- Enable
ai_claude_3_sonnet
feature flag - Do a search related to doc.
Related to #451215 (closed)